railroad bridge and track design and coordination issues lloyd m. wolf, p.e
TRANSCRIPT
RAILROAD BRIDGE AND TRACK DESIGN AND
COORDINATION ISSUESLloyd M. Wolf, P.E.
Coordination with Railroad
• Meet with Railroad Early in Project Development to Discuss
• Railroad Track Operations are Very Important
• Minimize Impact on RR Operations• LOA and RR Agreement
Structure Type Selection
andBridge Design
Superstructure Considerations
• Safety
–Highway Users
–Railroad
• Required Span for Horizontal Clearance
–Column Protection
• Adequate Vertical Clearance
Preferred Railroad Grade Separations
1. Overpass2. UPRR Steel Deck Girder Standards3. Deck Plate Girder w/ Steel Deck4. Steel Girder w/ Conc Deck5. Prestressed Beam w/ Conc Deck6. Thru-Girder w/ Steel Deck
UPRR Deck Girder Standard• Depth-Top / Rail to Low Chord = 5’-5”
• Steel Deck
• 69 ft Max
Span Length
Thru Girder• Depth-Top / Rail to Low Chord = 4’-6”
• Steel Deck
• 155 ft Max
Span Length
Superstructure Considerations
• TxDOT Design Requirements
• UPRR-BNSF Design Guidelines
• KCS Design Guidelines
• Composite and Non-Composite Design
• No Sacrificial Beams
• Design for 30” Ballast
• Ballast Depth for Concrete Tie
Vertical Clearance
• Steel Deck Girder 16.5 ft
• Steel Thru Girder-Bolt Bot Fl 17.5 ft
• Prestressed Conc 17.5 ft
• Hwy Over RR 23.33 ft
Design Development and Review
Processwith Railroads
Railroad Underpass
• 30% Submittal - Exhibit “A”
• 60% Submittal
• 90% Submittal
• 100% PS&E Plans
RR Agreement with Exhibit “B”
30% Submittal - Exhibit “A”• Preliminary:
– Bridge Layout
– Track Plan and Profile
– Track Typical Sections
• Structure Type Selection Report
– Thru Girder
• LOA Facilitate RR Review
Structure Type Selection Report
• Required for Thru-Girder• Design Factors Considered
–Underpassing Roadway Width–Clear Zone–Vertical Clearance
• Consider All Options for Railroad
RR Requirements Sheets
60% Submittal
• Complete Bridge Plans
• Complete Mainline and ShooFly Track Plans and Profiles
• Railroad Track Standards
• Mainline and ShooFly Typical Sections
60% Submittal, ctd• Track Sections every 50 ft
• Division of Labor
• Sequence
of Work
90% Submittal
• Revised Complete Bridge Plans
• Revised Complete Mainline and ShooFly
• Track Plans and Profiles
• Mainline & ShooFly Typ Sections
90% Submittal, ctd
• Track Sections every 50 ft
• All Parts of PS&E that Affect the Railroad
• All Specifications
100% Submittal• Complete PS&E That Affects RR• Complete Bridge Plans• Complete Mainline and ShooFly• Track Plans and Profiles• Mainline & ShooFly Typ Sections• Sequence and Division of Work• RR Agreement w/ Exhibit “B”
Attachment
Mainline Bridge Replacement
Shoo-Fly Construction
Track Plans & Sequence of Work
• Bridge Replacement on Mainline• Longer Span and Increased
Clearance• Track Raise• Shoo-Fly Construction Best
Maintains RR Operations
Track Design Speed
• Railroad Operating Dept
Determines Speed
• Mainline & ShooFly Same Speed ?
–Existing Conditions
–Future Upgrades
–Design Speed Agreement
Railroad Track Grade Raise
• No Grade Raise is Desirable
• 6” Max Raise with Ballast Only
• Use Subballast for Greater Raises
• ShooFly Profile Grade
• Ballast Delivery May Be an Issue
Bridge Designand
Track DesignResources
Bridge and Track Design Resources
• TxDOT and Individual Railroad• Use TxDOT Annotated Guidelines
–TxDOT Website• BRG Project Development Web Page
–BRG FTP Site• AREMA and AASHTO
Bridge and Track Design Resources
• UPRR, BNSF, KCS Guidelines and Standards
• Updated Requirements and Standards
TxDOT Bridge FTP Site:
–ftp://bridge:[email protected]
–Railroad Bridge and Track Design
Ballasted Track Construction Specification
• Bridge Division has a Reference Spec Available for Project Use
• Bridge Division is Workingto Develop StatewideSpecial Spec
ThankYou
Estimated Costs 2008
Bridgeand
Track
Estimated Railroad Costs 2008
Steel Deck Girder = $350 / SFwith Steel Deck
Steel Thru Girder = $450 / SFwith Steel Deck
Prestressed Beam = $225 / SFwith Concrete Deck
Estimated Railroad Costs 2008
ShooFly Bridge
with Open Deck =
$350,000 / EA
Temp SpecialShoring = $60 / SF
Estimated Railroad Costs 2008
Ballasted Track = $240 / LFwith 1 ft Raise
Ballasted Track = $170 / LFNo Raise
Ballasted Track = $45 / LFRemoval
Estimated Railroad Costs 2008
Turnout / Switch = $85,000 / EA
Signal for Switch = $50,000 / EA
Including Circuit
Estimated Railroad Costs 2008
Engineering Design Review = $100-175,000
And Construction Inspection
Railroad Flagging = $900 / Day
Mainline Track Raise at Turnout
Mainline Track Raise with Ballast Retainer